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RRB Group-D Model Paper 13 with answers for online practice
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Question : 85
Total: 100
In which of the following activities is work said to be done?
Khushi is pushing a wall of a house but fails to do so
Harsh is reading a book
Pinki is walking on a levelled road with a book on her head
Shruti is sitting on a chair
Validate
Solution:
Work:
Work done on an object is defined as the magnitude of the force multiplied by the distance moved by the object in the direction of the applied force.
The unit of work is the joule (1 Joule = 1 Newton-meter).
Work done on an object by a force would be zero if the displacement of the object is zero.
It is the dot product of force and displacement.
It is a Scalar quantity.
W = F.s cosθ.
Distance:
The length of the actual path covered by a moving object in a given time.
It is a scalar quantity.
It is always positive.
The unit of distance is a meter (m).
Displacement:
It is the shortest distance covered by a body in a definite direction.
It is a vector quantity.
It can be positive, Negative, or Zero.
The unit of displacement is a meter(m).
In this question, we can see that work done would be zero in all the above options except option 3.
In this case, when Pinki is carrying a book on his head, the gravitational force acts on his head and presses his head to make some displacement.
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